AAT2612 Datasheet, PDF (2/18 Pages) Skyworks Solutions Inc. – Step-Down DC/DC Converter With Three High PSRR LDOs

DATA SHEET
AAT2612
Pin Descriptions
Step-Down DC/DC Converter With Three High PSRR LDOs
Pin #
1
2, 8, 10, 18,
19
3
4
5
6
7
9
11
12
13,17
14
15
16
20
EP
Symbol
INL1
N/C
ENL1
INBK
LX
PGND
ENBK
FB
ENL2
ENL3
AGND
OUTL3
OUTL2
INL2
OUTL1
GND
Function
I
I
I
I/O
I
I
I
I
O
O
I
O
Description
Power input for LDO1. Connect a 2.2μF capacitor between this pin and ground.
Not Connected
Active high enable pin. When pulled high, LDO1 regulates its output to the programmed
voltage value.
Power input pin for the switching converter. Connect a 4.7μF capacitor between ground and
INBK.
DC/DC step-down converter switching node. Connect LX to the terminal of the inductor.
DC/DC converter power ground.
Active high step-down DC/DC converter enable pin.
DC/DC converter output feedback pin. Connect to a resistor divider for an adjustable out-
put voltage.
Active high enable pin. When pulled high, LDO2 regulates its output to the programmed
voltage value.
Active high enable pin. When pulled high, LDO3 regulates its output to the programmed
voltage value.
Analog ground.
LDO3 output. Connect a 1μF capacitor between the pin and ground.
LDO2 output. Connect a 1μF capacitor between the pin and ground.
Power input for LDO2/3. Connect a 2.2μF capacitor between the pin and ground.
LDO1 output. Connect a 1μF capacitor between the pin and ground.
Exposed pad.
Pin Configuration
TQFN33-20
(Top View)
20 19 18 17 16
INL1 1
N/C 2
ENL1 3
INBK 4
LX 5
15 OUTL2
14 OUTL3
13 AGND
12 ENL3
11 ENL2
6 7 8 9 10
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
2
202407B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 20, 2013